/**
 * @author wu
 * @date 2021/10/9 8:31
 */
import java.util.*;
public class Hello {
    public static void main(String[] args){
        int a[]={1,2,3,2,4,5,7,10,1,5,3,5,8,9,4,5,2,3};
        Map<Integer,String> map=new HashMap();
        for(int i=0;i<a.length;i++){
            map.put(a[i],"");
        }
        for(Integer s:map.keySet()){
            System.out.println("key的值："+s);
        }
    }
}
